1. Department of Geosciences, University of Arizona, Tucson, Arizona, USA;
2. Institute of Human Origins, School of Human Evolution and Social Change, Arizona State University, Tempe, Arizona, USA
3. School of Earth and Space Exploration, Arizona State University, Tempe, Arizona, USA
4. Department of Mining and Geological Engineering, Botswana International University of Science and Technology, Palapye, Botswana
5. School of Earth Science, Addis Ababa University, Addis Ababa, Ethiopia
6. Geosciences Department, Hamilton College, Clinton, New York, USA
7. National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
8. Berkeley Geochronology Center, Berkeley, California, USA
9. Department of Earth and Planetary Sciences, Rutgers University, Piscataway, New Jersey, USA
10. Institute of Geography Education, University of Cologne, Cologne, Germany
11. Department of Anthropology, University of Michigan, Ann Arbor, Michigan, USA
12. Department of Geography and Earth Science, Aberystwyth University, Aberystwyth, United Kingdom
13. Botany Department, School of Natural Sciences, Trinity College Dublin, Ireland
14. Department of Geological Sciences and Environmental Studies, Binghamton University, Binghamton, New York, USA
15. Lamont-Doherty Earth Observatory, Columbia University, Pallisades, New York, USA
16. National Museums of Kenya, Nairobi, Kenya
17. Department of Geology, University of Nairobi, Nairobi, Kenya
18. Department of Geography, Hong Kong Baptist University, Hong Kong
19. Human Origins Program, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
20. Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, Rhode Island, USA
21. Department of Earth and Environmental Systems, Indiana State University, Terre Haute, Indiana, USA
22. Department of Geosciences, University of Potsdam, Potsdam, Germany